1 public class Copy1 { 2  3     public static void main(String[] args) { 4         array1();                                        //如果不初始化元素，默认为0 5         int [][] a = new int [][]{
    {1,3,2,5,7},{5,9,3,4,2}}; 6         int [][] b = new int [a[1].length][a.length]; 7         for(int i=0;i